Because section steel can only be extended to the edge of the support

when a simple support RC beam is reinforced by bonded section steel

a notch comes into being at the end of the beam which is called a secondary dapped end beam

making the stress state of the beam more complex. Through experimental analysis on 21 dapped end beam specimens shear reinforced by steel plate bonded

the deformation process

performing characteristics and failure mechanism of the specimens were investigated. The result shows that two steel bonded forms

including horizontal steel plate and oblique steel plate with angle 45° bonded

delay the appearance of cracks significantly and improve the maximum bearing capacity by 102% and 93%. Due to the impact of stress concentration at the notch

the main modes of damage include concrete tensile or shear failure with the result of bonding failure of a steel plate. By changing the width of steel plates and analyzing different reinforcement effects

formula of bearing capacity of shear reinforcement was proposed based on the method of truss analogue

which provides a reference for engineering application.